Every time I hear "War Pigs", "Iron Man", or "Hand of Doom" I get chills down my spine.
The digitalized, filtered tone of today's nu metal/screamo/electro-rock just doesn't compare at all... in my mind.
I know Iommi had an SG... wasn't it baritone scale or something? I imagine he played through a big huge Marshall (in the days when there was no such thing as solid state).
What pedal, what amp, and what else would achieve this for today? I wouldn't want to be limited to Sabbath, per se, but I do think the tone of back then was superior to what's standard today.